单选题 Japanese factory workers are guaranteed lifetime jobs, bonuses paid on the basis of productivity and corporate profits, and a wage rate that is not attached to a particular job. Paradoxically, these guarantees do not discourage factory owners from introducing labor-saving machinery. Such innovations are to the factory owners' advantage despite the fact that the owners must protect the wages of their workers.
Which of the following, if true, logically explains why the introduction of labor-saving machinery is advantageous to factory owners?

A、 Before a Japanese factory worker is hired, he or she must present a record of his or her previous productivity.
B、 Labor-saving machinery increases productivity, thus yielding profits that more than cover the cost of retraining workers for other jobs.
C、 The purchase and maintenance of new machinery adds significantly to the final cost of the goods produced.
D、 Factory workers demand a change of procedure in the routine tasks they perform.
E、 (E) Limited competition exists among Japanese factories for consumer markets.

【正确答案】 B

【答案解析】[解析] 本题目的清晰，让我们寻求一个选项解释为什么引进劳动力节约型的机器对工厂主是有利的。(B)明显指出了劳动力节约型的机器所带来的利润要高于重新培训工人做其他工作的费用，说明了这样做的优点，因此起到了解释作用，所以(B)正确；(A)、(D)、(E)均为无关选择；(C)易误选，但(C)是一个削弱上面事实的选项，所以(C)不正确。